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38. Hydrogen has high ionisation energythan alkali metals, due to its |
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Answer» The atomic number of hydrogen is 1. It means that hydrogen has just 1 electron and an electronic configuration of K 1. This electron is close to the nucleus and it has an high electrostatic force with respect to the nucleus. So, a lot of energy is required in order to pull off that 1 valence electron. Where as, any other element after Hydrogen has valence electrons more distant from its and the valence electrons are not pulled by the nucleus with a greater force and the energy levels to pull them off from their valence shells are low. |
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